Home Voip Setup

Hello All,


I am a newbie to Voip.trying to setup a voip over vpn.
will this design work? Appreciate any suggetion and possible modifications needed and help in identifying products that can help.


City A>

Analog phone>Voip ATA>VPN Router>ADSL router>Internet


City B>


Internet>ADSL router>VPN Router>SIP Server or IPPBX>Voip ATA>Analog phone

Assumptions
1. I dont want to involve a voip service provider.
2. Configure a site to site VPn

Products to review.

1. VOIP ATA :SIPura
2. VPN Router : any site to site vpn capable router.
3. Sip Server: any Asterix based hardware solution.

ren